I'm gonna have to agree with Thick Dog on this (as much as it pains me). And not agree with Corn. Squating every week, is the way to go. (Although, I must say I train with powerlifters, and athletes, not BBs)
Naturally variety is good, and alters your routine to optimize as many actin-myosin pairings in the target muscle as possible. But Squats, hands down, is the best in repects to the quanity of muscles it targets for legs. it should be the basis of you leg routine, while others are supplemental.